Y wing styles show up with such frequency, perhaps I will blog a page that details how to find them. Often, I visit forums about sudoku and see some very complex and tortured explanation of how to advance a puzzle past a particular point - yet a simple Y wing style unlocks the entire More...

Good Maen all ! 16:09 which for me is getting better on Tough. Love the stained glass...it's a beautiful Cathedral.

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Nice

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This took way too long, but I love the prize of a beautiful picture at the end.

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They sure don't make them like they used to. Just beautiful!

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Not so easy. Made some mistakes and I pray.

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is this the Washington National Cathedral i DC? I haven't been there in decades, but wanted to get married there.

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It's always possible to do the toughies. Fill in all the possibilities & the uniques. Eliminate all easy forbidens and then switch to 'allow incorrect mode' Start filling in on a chain from a double or a triple and then follow it to the end. If it doesn't pan out try with the other number(s)from the original double or triple. It always works. Takes around 20min every time with never a mistake.

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This looks like it would be a nice place to visit.

Have a great day everyone.

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Hi Jax!The method you describe is usually the most time efficient manner to tackle such a puzzle. However, many will find such a plan of attack feels too much like guessing. More precisely, it is known as Ariadne's Thread.

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I have added another new blog page, Finding Ywing Styles.

A link to this page is in the upper right column, directly under 'Check out the Sudoku Blog'.

Hopefully, the procedure described for finding such eliminations will be helpful for many.

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Hi everyone and nice maEn to all.I like such stained glass fine art specially in churches and cathedrals as it gives a beautiful colour reflection which add more respection and quite to the place.

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No guesses today!

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32:45 I would like to see a simple explanation on how the Y wings work.

Steve, I got up to 28 or 29 filled by myself, then looked at your proof. I had missed the 369 in step 2c and added one more number but could not get up to 42, even tho I'd already found the 78 in step 3 (by the way, b3 and c2, not b2 and c3). Your Y wing style solved everything. Maybe your new blog More...

Not too bad. reductions, pointing pairs, more reductions, a 2-string kite, A hidden 58, eventually only conjugate pairs or triples (BUG+several). Too lazy to find the XYZ-wing(s) so started coloring. got lucky, my first chain was invalid making all the non-colored pairs correct, done. Fun. Regards all. Nice pic, tripod with a short timed exposure?